Method for estimating sampling clock skew based on orthogonal frequency division multiplexing system

Abstract

The invention relates to a method for estimating sampling clock skew based on an orthogonal frequency division multiplexing (OFDM) system. The method comprises the following steps: firstly analyzing the skew of a timed value in a period of fixed time to capture a skew value of a sampling clock, then tracking the skew of the sampling clock, and fine tuning the skew of the sampling clock after accumulating the skew of the timed value to a threshold value. The method directly uses a sign timing synchronous result for computation, reduces the realization complexity and has high estimated accuracyand stability.

Description

【Technical field】

[0001] The invention belongs to the field of digital signal transmission, in particular to a method for estimating sampling clock offset based on an Orthogonal Frequency Division Multiplexing (OFDM) system. 【Background technique】

[0002] The synchronization part of the OFDM receiver mainly includes frequency synchronization, sampling clock synchronization and symbol timing synchronization. For OFDM receivers, the sampling clock deviation will cause signal phase rotation and amplitude attenuation, destroy the orthogonality between OFDM subcarriers, and reduce system performance; at the same time, it will also cause the increase or decrease of sampling points, affecting some synchronization algorithms usage of. Therefore, the estimation and compensation of the sampling clock offset is very important in the OFDM receiving system.

[0003] At present, the estimation of the sampling clock offset by the OFDM receiving system is mostly calculated according to t...

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